Acta Geodaetica et Geophysica Hungarica
Volume/Issue:
Volume 37: Issue 4
On the region of mid-latitude spread-F
Author: P. Bakki 1
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  • 1 Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences H-9400 Sopron, Csatkai E. u. 6-8, Hungary
DOI:
https://doi.org/10.1556/ageod.37.2002.4.4
Page Count:
409–417
Publication Date:
01 Oct 2002
Online Publication Date:
19 Jul 2005
Article Category:
Research Article
Restricted access

Mid latitude spread-F has extensively studied recently as  compared to the earlier periods. In the course of these  investigations two concepts have appeared in the literature concerning the origin of the mid-latitude spread-F. The first concept based on radar measurements attributes the development of spread-F to plasma instabilities (Fukao et al.\ 1988), while according to the other concept based on the vertical incidence sounding of the ionosphere the occurrence of mid-latitude spread-F is related to travelling ionospheric disturbances (Bowman 1981). Therefore, it seemed worthy to study mid-latitude spread-F from the point of view of its origin. This study has been carried out by analysing the connection between  the occurrence of spread-F and the occurrence of sporadic E layers, keeping in mind that the development of sporadic E layers at mid-latitude is due to atmospheric gravity waves, which initiate plasma instabilities. On the other hand, the relation of the occurrence of spread-F to enhancements of the auroral electrojet index (AE) has been studied indicating the occurrence of large scale travelling ionospheric disturbances.

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Cover Acta Geodaetica et Geophysica Hungarica
Acta Geodaetica et Geophysica Hungarica
Print ISSN:
1217-8977
Online ISSN:
1587-1037
Keywords:
atmospheric gravity waves; atmospheric gravity waves; auroral electrojet; spread-F and plasma instabilities; spread-F and travelling ionospheric disturbances

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